yamanaka discovered how to transform ordinary skin cells into stem cells. it could one day help scientists grow taylor-made replacement organs. yamanaka said he was thankful for all the support he has received in the bay area. the president of the institute calls it a real breakthrough. >> this is a revolution in biology. no one thought it worked this way. that turning a few switches, you could create such a profound change in the identity of the cell. and this swept the world. >> researchers say this discovery could help with alzheimer's disease, heart, brain, and retina care. so congratulations to the researcher. >>> well, warning for women about a popular bay area trail. more on that tear fight attack, next. >>> also, he is facing a life sentence in prison. but convicted sex offender jerry sandusky isn't going down without a fight. hear the jailhouse recording from the former penn state football coach. >>> and a fishy situation for moms to be. why high levels mercury are now being linked with a childhood disorder. >>> and we're seeing some cooler tempera